The FW & BW tanks are somewhat forgiving of a freeze. If the FW tank is leaking it will show up on the floor. The BW tank is a bit more difficult. It most likely sits in a metal pan, under the floor, wrapped in insulation, behind the belly pan. You could damage an otherwise ok tank getting to it for a look. If it did crack you will know soon enough by the drip on the ground and the odor! Toilets and water pumps are not forgiving of freezing, they crack. I'd guess you'll find a crack in your toilet near the bottom where it sits on the deck. The leak when you flush is an indication. You MAY have a bigger issue. When the copper waterlines freeze at the very least they stretch [expand]. Often the soldered joints are weakened and give trouble in the future, one after another, on & on. The pipes and fittings are usually so distorted you can't splice or re-solder. With todays prices thats when you learn about pex. Fact is frozen plumbing in these oldtimers is the norm up north.
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